1 /* 2 * OF graph binding parsing helpers 3 * 4 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. 5 * Author: Sylwester Nawrocki <[email protected]> 6 * 7 * Copyright (C) 2012 Renesas Electronics Corp. 8 * Author: Guennadi Liakhovetski <[email protected]> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of version 2 of the GNU General Public License as 12 * published by the Free Software Foundation. 13 */ 14 #ifndef __LINUX_OF_GRAPH_H 15 #define __LINUX_OF_GRAPH_H 16 17 #include <linux/types.h> 18 19 /** 20 * struct of_endpoint - the OF graph endpoint data structure 21 * @port: identifier (value of reg property) of a port this endpoint belongs to 22 * @id: identifier (value of reg property) of this endpoint 23 * @local_node: pointer to device_node of this endpoint 24 */ 25 struct of_endpoint { 26 unsigned int port; 27 unsigned int id; 28 const struct device_node *local_node; 29 }; 30 31 /** 32 * for_each_endpoint_of_node - iterate over every endpoint in a device node 33 * @parent: parent device node containing ports and endpoints 34 * @child: loop variable pointing to the current endpoint node 35 * 36 * When breaking out of the loop, of_node_put(child) has to be called manually. 37 */ 38 #define for_each_endpoint_of_node(parent, child) \ 39 for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \ 40 child = of_graph_get_next_endpoint(parent, child)) 41 42 #ifdef CONFIG_OF 43 int of_graph_parse_endpoint(const struct device_node *node, 44 struct of_endpoint *endpoint); 45 struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id); 46 struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, 47 struct device_node *previous); 48 struct device_node *of_graph_get_remote_port_parent( 49 const struct device_node *node); 50 struct device_node *of_graph_get_remote_port(const struct device_node *node); 51 #else 52 53 static inline int of_graph_parse_endpoint(const struct device_node *node, 54 struct of_endpoint *endpoint) 55 { 56 return -ENOSYS; 57 } 58 59 static inline struct device_node *of_graph_get_port_by_id( 60 struct device_node *node, u32 id) 61 { 62 return NULL; 63 } 64 65 static inline struct device_node *of_graph_get_next_endpoint( 66 const struct device_node *parent, 67 struct device_node *previous) 68 { 69 return NULL; 70 } 71 72 static inline struct device_node *of_graph_get_remote_port_parent( 73 const struct device_node *node) 74 { 75 return NULL; 76 } 77 78 static inline struct device_node *of_graph_get_remote_port( 79 const struct device_node *node) 80 { 81 return NULL; 82 } 83 84 #endif /* CONFIG_OF */ 85 86 #endif /* __LINUX_OF_GRAPH_H */ 87